Brand new Buck 8" lathe chuck. I was going to use this on my Clausing 5914, but went with a 6" instead, so this is just sitting under my bench. Comes with key, extra jaws, and Bison backing plate for L00 mount (you can take or leave the backing plate to save on shipping costs!). Specs on the Buck website: http://www.buckchuckusa.com/products...3-jaw-rev.html